Solid colors are 100% cotton. Other colors will include polyester. Either way, the fabric will be smooth and soft against your young one's skin. There are plastic snaps at the cross closure for easy changing. All bindings have ribbed knitting for durability and improved range of motion. 
.: Material: 100% combed ring-spun cotton (fiber content may vary for different colors)
.: Light fabric (5.0 oz/yd² (170 g/m²))
.: Classic fit
.: Tear-away label